An over-potential of 250 mV is applied to platinum in an aqueous and electrolyte. What would be the rate of hydrogen evolution if the exchange current of hydrogen on platinum is 1 x 10-4 A/cm2 and B = 0.5? %3D e 3:08

Activated carbon is being used in a batch process to remove pesticides from a rural water supply. After each batch of water is treated, the carbon particles are allowed to settle, the water is drained off, and a new batch of water is mixed with the carbon. The adsorption is known to follow a Langmuir isotherm. After a number of batches of water have been treated in this way, the adsorption density on a sample of the activated carbon is given by: q ¼ (qmax/Kadscin)/ (1 + Kadscin), where cin is the pesticide concentration in the untreated influent water. The value of q under these circumstances is much less than qmax. Do you think that the removal efficiency of pesticide in the next batch of water to be treated will be good or poor? Explain briefly.

Lamiar flow takes place in acircular Lube. At what distance from the boundary does the local velcity equal the average Velocity-

Which one of the following is NOT a way minerals form? O Compression of organic material on the surface Precipitation from solution Crystallization from magma Biological precipitation by organisms